perennial

Hollyhock

Alcea rosea 'Polarstar'

Not currently listed at our partner nurseries.

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Essentials

At a Glance

Plant Type

Perennial

Height

60 inches

Width

24 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8, 9

Water

Moderate

Humidity

Average

Lifespan

Perennial

Native To

Asia

Toxicity

Non-toxic

The Story

Plant Bio

Alcea rosea 'Polarstar' is a tall perennial with attractive white flowers and a robust structure, often used in borders and gardens. This cultivar features exceptionally pure white blooms and a long flowering season, distinguishing it from other hollyhocks.

Bloom Period:

EarlyLate

Uses & Benefits:

Alcea rosea Polarstar adds vibrant pink color and tall structure to garden borders, attracting butterflies and hummingbirds.

Provides a natural screen or backdrop in flower beds.

Supports pollinators by providing nectar-rich flowers.

Marketplace

Where to Buy

We couldn't find this plant listed online right now.

Shipping costs Year-round shipping Free shipping

Planting

How to Grow

Tuck seeds 1/4 inch deep into well-draining soil in early spring.
Water regularly to keep soil moist but not waterlogged.
Provide full sun for optimal growth and flowering.
Support tall stems with stakes to prevent wind damage.
Fertilize monthly with a balanced fertilizer during the growing season.
Deadhead spent flowers to encourage more blooms.

Pro Tip

Start seeds indoors 6 weeks before the last frost for earlier blooms.

Keep It Thriving

Care Guide

Do

Tuck seeds into moist soil for germination 🌱
Prune after flowering to promote bushier growth
Water consistently during dry spells
Apply organic compost yearly

Don't

Don't overwater to prevent root rot ❌
Avoid heavy clay soil without amendment
Refrain from fertilizing late in the season
Don't let stems flop without support

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Pest Check
Prune
Spring Cleanup
Stake

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Airy flower borderColorful perennial bedTall accent plant in cottage garden

Companion Plants

Lavender Coreopsis Salvia Echinacea Gaillardia

Multiply

Propagation Methods

Good to Know

Common Questions

Hollyhock questions

What zones can Hollyhock grow in?

Hollyhock is hardy in USDA Zones 4–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Hollyhock deer resistant?

Not reliably. Deer may browse Hollyhock, especially tender spring growth — plan on repellents or fencing where pressure is high.

When does Hollyhock bloom?

Hollyhock typically blooms in mid-summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Hollyhock need full sun?

Hollyhock does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Hollyhock drought tolerant?

Yes — once established (usually after the first full season), Hollyhock handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.